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We have applied the discrete-ordinate method to solve the radiative-transfer problem pertaining to a system consisting of two strata with different indices of refraction. The refraction and reflection at the interface are taken into account. The relevant changes (as compared with the standard problem with a constant index of refraction throughout the medium) in formulation and solution of the radiative-transfer equation,' including the proper application of interface and boundary conditions,doi:10.1364/ao.33.000431 pmid:20862035 fatcat:7b5nyy52vvh45mzb7ctfkmnci4